Unnamed

Occurrence in Alaska, United States with commodities Copper, Lead, Zinc

Geologic information

Identification information

Deposit ID 10003124
MRDS ID A015661
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -171.37429, 63.33023 (WGS84)
Relative position This site is on a wave cut bench and adjacent tidal zone about 1/2 mile west of the mouth of the Okok River on the southwest coast of St. Lawrence Island. It is located within 1/4 mile and is locality 11 of Cobb (1972). Cobb (1980) summarized relevant references under the name 'Unnamed occurrence'.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Lead Primary
Zinc Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Sphalerite Ore
Calcite Gangue
Pyrite Gangue

Alteration

  • (Local) Alteration is not described.??

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro

Nearby scientific data

(1) -171.37429, 63.33023

Comments on the geologic information

  • Geologic Description = Fine-grained gabbro, exposed on the wave cut bench here, is cut by a 1- to 2-inch wide calcite vein that contains galena, sphalerite, chalcopyrite, and pyrite (Patton and Csejtey, 1971, p. C15). A sample of this vein contained 1,000 ppm silver, 1 % copper, greater than 2 % lead, and greater than 1 % zinc (Patton and Csejtey, 1971, p, C8).
  • Age = The gabbro is mapped as part of a mafic Triassic to Permian age assemblage (based on the results of two K/Ar age determinations,221 +/- 7 and 244 +/- 7 Ma, Patton and Csejtey, 1980). However, the calcite-sulfide vein could be Cretaceous or Tertiary, the age of younger igneous rocks on western St. Lawrence Island (Patton and Csejtey, 1980).

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bering Sea

Comments on the workings information

  • Workings / Exploration = A sample of this vein contained 1,000 ppm silver, 1 % copper, greater than 2 % lead, and greater than 1 % zinc (Patton and Csejtey, 1971, p, C8).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015661
Unknown MF MF 0465-11
USGS Alaska Resource Data File ARDF SL013

Bibliographic references

  • Deposit

    Patton, W.W., Jr., and Csejtey, Bela, Jr., 1971, Preliminary geologic investigations of western St. Lawrence Island, Alaska: U.S. Geological Survey Professional Paper 684-C, p. C1-C15.

  • Deposit

    Patton, W.W., Jr., and Csejtey, Bela, Jr., 1980, Geologic map of St. Lawrence Island, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1203, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1980, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in fifteen quadrangles in southwestern and west-central Alaska: U.S. Geological Survey Open-File Report 80-909, 103 p.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Saint Lawrence quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-465, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Patton and Csejtey, 1971 (PP 684-C)

General comments

Subject category Comment text
Deposit Model Name = Sulfide-bearing calcite vein in gabbro.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-SEP-1998 Travis L. Hudson Applied Geology